<!doctype html>
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<html>
<head>
  <title>core-scroll-header-panel</title>
  
  <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0">
  <meta name="mobile-web-app-capable" content="yes">
  <meta name="apple-mobile-web-app-capable" content="yes">

  <script src="../platform/platform.js"></script>
  
  <link rel="import" href="core-scroll-header-panel.html">
  <link rel="import" href="demos/lorem-ipsum.html">
  <link rel="import" href="../core-toolbar/core-toolbar.html">
  <link rel="import" href="../core-icon-button/core-icon-button.html">

  <style shim-shadowdom>

    html, body {
      height: 100%;
    }

    body {
      margin: 0;
      font-family: sans-serif;
      color: #333;
    }

    core-scroll-header-panel {
      position: absolute;
      top: 0;
      right: 0;
      bottom: 0;
      left: 0;
    }
    
    /* background for toolbar when it is at its full size */
    core-scroll-header-panel::shadow #headerBg {
      background-image: url(demos/images/bg9.jpg);
    }
    
    /* background for toolbar when it is condensed */
    core-scroll-header-panel::shadow #condensedHeaderBg {
      background-color: #f4b400;
    }
    
    core-toolbar {
      color: #f1f1f1;
      fill: #f1f1f1;
      background-color: transparent;
    }
    
    .title {
      -webkit-transform-origin: 0;
      transform-origin: 0;
      font-size: 40px;
    }
    
    .content {
      padding: 10px 30px;
    }

  </style>

</head>
<body unresolved>

  <core-scroll-header-panel condenses>

    <core-toolbar class="tall">
    
      <core-icon-button icon="arrow-back"></core-icon-button>
      <div flex></div>
      <core-icon-button icon="search"></core-icon-button>
      <core-icon-button icon="more-vert"></core-icon-button>
      <div class="bottom indent title">Title</div>
      
    </core-toolbar>
    
    <div class="content">
      
      <lorem-ipsum paragraphs="100"></lorem-ipsum>
      
    </div>
    
  </core-scroll-header-panel>
  
  <script>
  
    // custom transformation: scale header's title
    var titleStyle = document.querySelector('.title').style;
    addEventListener('core-header-transform', function(e) {
      var d = e.detail;
      var m = d.height - d.condensedHeight;
      var scale = Math.max(0.75, (m - d.y) / (m / 0.25)  + 0.75);
      titleStyle.transform = titleStyle.webkitTransform = 
          'scale(' + scale + ') translateZ(0)';
    });
  
  </script>
  
</body>
</html>
